India's revolutionary Aravind Eye Care System has given sight to millions.

Thulasiraj Ravilla looks at the ingenious approach that drives its treatment costs down and quality up, and why its methods should trigger a re-think of all human services. Thulasiraj Ravilla is the executive director of the Lions Aravind Institute of Community Ophthalmology, helping eye-care hospitals around the world build capacity to prevent blindness.